Superheroes of all shapes and sizes are hitting the big screen this summer. From the Nordic god of thunder, Thor, played by Chris Hemsworth, to the Green Lantern played by Ryan Reynolds, their costumes are a thought experiment in fashion and wardrobe. While Hemsworth suited up in his red cape and armor, the visually unconventional outfit and musculature of Reynolds was CGI’ed onto him in post-production.

Michael Fassbender played Magneto in “X-Men: First Class” and Chris Evans will be Captain America in its namesake film. Both men have more straightforward suits that hail back to their comic book character roots.

Insofar as supporting characters there’s Blake Lively, who for now is simply Carol Ferris in “Green Lantern,” but there’s talk about her staying on and in future films transforming into Star Sapphire. Lively mentioned that the illustration of the costume is on the skimpy side. Anthony Hopkins plays Odin in “Thor” and has a costume remarkably similar to that of Hemsworth while Tom Hiddleston stars as Loki, Thor’s brother. His costume also errs on the more conservative side unlike that of January Jones, who is Emma Frost in “X-Men: First Class.” Transforming into a chiseled diamond from head to toe, Jones also suffers from a case of CGI. Breathtaking, yes, pragmatic, no.

But lest fans forget, many superhero costumes began as simple leotards, which don’t translate well onto the big screen. What do you think of the superhero fashions?

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Speakeasy is a blog covering media, entertainment, celebrity and the arts. The publication is produced by Barbara Chai and Jonathan Welsh with contributions from the Wall Street Journal staff and others. Write to us at speakeasy@wsj.com or follow us on Twitter at @WSJSpeakeasy or individually @barbarachai.